DISORDER DEPENDENCE OF ELECTRON-PHONON SCATTERING TIME IN BULK TI1-XALX ALLOYS

We have fabricated crystalline disordered bulk Ti1-xAlx alloys (0.04 l ess than or similar x less than or similar 0.15) with impurity resisti vities rho(10 K) varying from almost-equal-to 60 to 180 muOMEGA cm. Wi th this wide range of rho(10 K) controllably accessible, we were able to perform an experimental investigation of the disorder dependence of electron-phonon scattering time tau(e-ph). We measured the magnetores istivities of these alloys, and compared our measured results with wea k-localization and Maki-Thompson superconducting fluctuation theories to extract tau(e-ph). We found that tau(e-ph) in all alloys obey a T-2 -dependence in our temperature range of (3-10) K. Particularly, we obs erved that tau(e-ph) scales with disorder, i.e. tau(e-ph) approximatel y rho-1 for rho(10 K) in the range (60-150) muOMEGA cm. Our results su pport a theory of electron-phonon interaction in disordered metals, wh ich considers an Eliashberg function alpha2F(omega) that is linear in omega. The magnitudes of our measured tau(e-ph) are consistent within approximately 40% with the theoretical prediction.